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river: wrap monotonic time > 2^32-1 milliseconds

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Fixes: https://codeberg.org/river/river/issues/1176
(cherry picked from commit 6abcc68a19)
This commit is contained in:
Isaac Freund
2024-12-30 09:21:24 -06:00
parent a5f94268e6
commit 840eacae62
1 changed files with 7 additions and 2 deletions
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9
river/Cursor.zig
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@ -1091,8 +1091,13 @@ pub fn updateState(cursor: *Cursor) void {
if (!cursor.hidden) {
var now: posix.timespec = undefined;
posix.clock_gettime(posix.CLOCK.MONOTONIC, &now) catch @panic("CLOCK_MONOTONIC not supported");
const msec: u32 = @intCast(now.tv_sec * std.time.ms_per_s +
@divTrunc(now.tv_nsec, std.time.ns_per_ms));
// 2^32-1 milliseconds is ~50 days, which is a realistic uptime.
// This means that we must wrap if the monotonic time is greater than
// 2^32-1 milliseconds and hope that clients don't get too confused.
const msec: u32 = @intCast(@rem(
now.tv_sec *% std.time.ms_per_s +% @divTrunc(now.tv_nsec, std.time.ns_per_ms),
math.maxInt(u32),
));
cursor.passthrough(msec);
}
},